Machine for the manufacture of sheet-metal articles



(No Model.)

Sh t-'-Sh J. R. PADDAOK. 3 3 MACHINE FOR THE MANUFACTURE OF SHEET METAL ARTICLES.

' No. 488,633. Patented Dec. 27, 1892.

(No Model.) J. PADDAGK 3 Sheets-Sheet 2.

MACHINE FOR THE MANUFACTURE 0F SHEET METAL ARTICLES.

No. 488,633. Patented Dec. 27, 1892.

- MIMI! f unm 5 7 1 i! ii a l (N6 Model.) J R PADDAGK a Shets-Sheeta,

MACHINE FOR THE MANUFACTURE OF SHEET METAL ARTICLES. No. 488,633.

H Patented Dec. 27,1892.

%Vm YA /1 1r '1 UNITED STATES PATENT OFFICE.

JAMES R. PADDACK, OF OINOINN ATI, OHIO.

MACHINE FOR THE MANUFACTURE OF SHEET-METAL ARTICLES.

SPECIFICATION forming part of Letters Patent N 0. 488,633, dated December 27, 1892. Application filed March 5, 1892. Serial No. 423,922. (No model.)

To all whom it may concern.-

Be it known that I, JAMES R. PADDACK, a citizen of the United States, residing at Oincinnati, Hamilton county, Ohio, have invented certain new and useful Improvements in the Manufacture of Sheet-Metal Articles, of which the following is a specification.

My invention relates to the manufacture of sheet metal vessels having the edges curled to form ribs, and my invention consists of apparatus for facilitating the formation of said curls and for insuring the regular form and dimensions thereof as fully set forth hereinafter and as illustrated in the accompanying drawings, in which:

Figure 1 is a view illustrating the arrangement of the diesin my improvement. Fig. 2 illustrates the form of curl produced. Figs. 3 and 4 illustrate defective forms of curls produced by ordinary methods. Figs. 5 and 6 are sectional elevations of a machine embodying my improvements. tional plan on the line 7-7, Fig. 5. Fig.8 is a sectional plan of the cap-die.

In the manufacture of sheet metal vessels, pails and coal buckets for instance, with flaring or inclined sides the attempt to curl the edges to form beads results in the production of a regular bead if the metal is curled but once, but where the pressure is continued with the view of forming a concentric or double curl the strength imparted by the first curl of the metal gives such stiffness to the edge that the further pressure results, in many'instances, in forcing the curl from the curling groove.

In order to insure the proper curling of the metal however long the pressure may continue to make one, two or more perfect curls I combine with the curling die E having the curling groove 1, and also preferably the inclined bearing face 2, adapted to support the body X of the vessel, a removable confining cap die J, having a groove 3, so that the two grooves l and 3 will form practically a circular curling groove, and when the body X of the vessel is forced with a powerful pressure in the direction of the arrow Fig. 1, the bead formed by the first curl is held in place and prevented from spreading as the pressure is continued to produce a second curl, the re- Fig. 7 is a -sec-= contracting sult being that one curl is spirally formed in the other as shown in Fig. 2. It will of course be evident that as the flaring vessel is carried downward it is necessary for the curling die E to move inward in the direction of the arrow a, Fig. 1, but it has been found in practice that if the die begins its movement in said direction before the edge of the vessel has begun to assume its curled form the said edge will bend abruptly forming a flange at a sharp angle as in Fig. 3, and that the continued operation will result in a curl or head of the character illustrated in Fig. 4. To prevent this I combine with the parts of a sectional die E, a locking device G which is held in position to prevent the inward radial movements of saidparts until the edge of the vessel has begun to assume its curved shape, and then the locking device is withdrawn and the continued pressure upon the body of the vessel gradually curves the edge thereof while the sections of the die move inward to accommodate themselves to the gradually diameter of the edge portion; The cap die J, and the locking device G may be constructed and applied in different forms, and different connections may be employed for carrying these parts into and out of position automatically and I will now describe one construction which in operation has proved effective.

D is the base-plate of the device having seats for the sections of the die E, each section having a groove rounded and curved and the grooves together constituting the curling groove 1, and a portion of each section extending upward and having an inclined face 2, the inclination of which corresponds to that of the body of the vessel to be operated upon. A spring I bearing upon part of the base and upon a part of each section serves to throw the latter normally to the limit of its outward position, while an annular cap piece F bolted to the base and extending over all of the sections holds them in position upon vthe base without interfering with the radial movement of each.

The body of the vessel is clamped between the movable clamps B and O, conforming to the shape of said body, and suitably supported upon the base or otherwise so as to have a vertical downward movement under the plunger of a press or other means for securing the action with the requisite power, and I prefer to carry the cap-die J by the outer clamp B. Thus, as shown the sectional capdie with the confining groove 3, and an inclined face 5, conforming to the inclination of the body of the vessel is provided with guide rods K, that are inclined and extend into inclined guide openings'6, in the clamp B, so that the said die can slide in a direction parallel to the side of the vessel, a lip 7 limiting the downward movement of the die and springs 8 between the clamp B and the die tending to hold the latter at the limit of its downward movement.

Thelocking device G is in the form of an annularring in a recess 9 of the base D and seated. upon a spring 1 0 which tends to hold the locking ring in a position behind the sections of the die E until the ring is forced downward by the contact of pins 12, project.- ingdownward from the clamp O and of such length as to strike thering only after the edge of'the vessel has been curled to a slight extent. After the ring has been pushed down below thelower edges of the sections of the die E the said sections will move inwardv as the body of the vessel descends and the parts areso arranged that as the first curl of the metal approaches completion the cap-die J will be brought in position upon the die E, as shown in Fig, 6 to confine it in the curling groove during the remainder of the operation and until the lower edge of the clamp B comes intocontact with the base D thereby compressing and reducing the first round of the curl so it will take its place on the inside of the second round.

Without limiting myself to the precise construction and arrangement of parts shown and described, I claim:

1. The combination of a curling die. consistingv of a series of radially movable sections each having a curling groove, and a cap die also in sections movable to and from the curling die, clamps for holding the body of the article, and means for connecting the capdie with one of the clamps, substantially as set forth.

2. The combination of a base, a curling die consisting of sections supported by said base to move radially thereon, springs for moving the curling die sections outward, and a capdie having a curling groove and formed in sections and adapted to be applied to and removed from the curling die, substantially as set forth.

3. The combination of the base, a curling die in sections supported by the base, clamps for supporting the body of the article to be curled, and a cap-die in sections provided with guide rods and carried by one of the clamps, and springs for depressing the sections of the cap-die, substantially as described.

4. The combination of a curling die consisting of radially movable sections and a locking device for holding the sectionsin place, and means for displacing the locking device after the beginningot' the curling action,.substantially as described.

5. The combination of the base, a sectional curling die supported thereon, a movable locking device for said sections, a clamp for holding the body of the article to be curled and means for displacing the locking device after the clamp has moved to a limited ex tent, substantially as set forth.

6. The combination of the base, curling die, consisting of sections supported to move radially on the base, locking device G supported by a springin position to lock said sections, clamps for holding the body ofthe article and movable to and from the base, and pins 12 extending from oneof the clamps in position to make contact with the locking device, substantially as and for the purpose set forth.

JAMES R. PADDAOK. Witnesses:

W. CLARENCE DUVALL, CHARLES E. FOSTER. 

